انكثب doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• انكثب Form 7

  7 انكثب ذ It (sand) collected. (S.) -b2- انكثب فِيهِ It (anything) poured out, or forth, or was, or became, poured out, or forth, into it, (S,) and collected. (TA.) -b3- انكثب It (dust, or earth,) was, or became, scatter…

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